condition mean min max ZT0-3 0.8294175 0.6203375 1.0384975 ZT4-7 3.687635 3.687635 3.687635 ZT8-11 4.36505 4.36505 4.36505 ZT12-15 0 0 0 ZT16-19 3.51396 3.51396 3.51396 ZT20-23 2.21343 2.21343 2.21343